1. yo (I)
2. tú (you, informal)
3. él (he)
4. ella (she)
5. usted (you, formal)
6. nosotros (we)
7. vosotros (you all, informal)
Note:
* vosotros is only used in some dialects, mostly in Spain. In most of Latin America, the pronoun ustedes (you all, formal) is used instead.
* ellos (they, masculine) and ellas (they, feminine) are plural forms of él and ella, respectively. However, they are not considered separate subject pronouns.